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_z_ <br />PURPOSE AND SCOPE OF STUDY <br />This report presents tl'~e results of a subsurface study for <br />design of foundations and general grading at the New Castle <br />Energy Corporation Mine site, about two miles east of New Castle <br />in Garfield County, Colorado. A grading plan of the proposed <br />development as provided by Schmueser & Associates, Inc., is shown <br />on Fig. 1. Chen and Associates, Inc., previously conducted a <br />preliminary geotechnical investigation for proposed surface mine <br />facilities in the same general area as the current study which <br />included field mapping oC the surface geologic cenditions and <br />exploratory boring drilling. The report was submitted to Dravo <br />Corporation dated Nover.~ber 10, 1983, Job Pfo. 25,999• The find- <br />ings of the previous report have been used to supplement this <br />report where deemed appropriate. <br />A field exF;eration program consisting of exploratory borings <br />was conducted to obtain information on subsurface conditions. <br />Samples obtained during the field exploration were tested in the <br />laboratory to determine the classification and engineering char- <br />acteristics of the on-site soils. The results of the field <br />exploration and laboratory testing were analyzed to develop <br />recommendations for foundation types, depths and allowable pres- <br />sures in the dewatering building and thickener site. The data <br />was also analyzed to provide general comments regarding grading <br />and surface drainage. The results of the field exploration and <br />the laboratory testing program are presented herein. <br />This report has been prepared to summarize the data obtained <br />during this study and to present our conclusions and recommenda- <br />Chen &r~ssociatcs <br />